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The Company, Liquidity, and Basis of Presentation (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
 9 Months Ended
Aug. 08, 2025
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accumulated deficit   $ (979,222)   $ (767,623)
Cash flows from operations   (137,665) $ (117,393)  
Series D-1 Preferred Stock funding   $ 244,700    
Common stock retained par value   $ 0.0001   $ 0.0001
Common stock reverse split   1-for-3.2544    
IPO        
Proceeds of underwritng discounts $ 932,300      
Proceeds of commission received 57,400      
Offering costs 11,400      
Accrued interest 11,400      
Stock-based compensation expense. $ 3,000      
Common Stock        
Common Stock, Initial public offering 22.2      
Common stock retained par value $ 0.0001      
Convertible preferred stock, shares issued upon conversion 105.8      
Common stock, share exercised 0.6      
Common Stock | IPO        
Common Stock, Initial public offering 2.9      
Common stock retained par value $ 45      
Proceeds from initial public offering $ 998,600      
Common Warrants        
Common stock, share exercised 1.0      
Series D-1 Preferred Stock        
Series D-1 Preferred Stock funding   $ 5,000